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Am getting Blue screens, the sure thing that a blue screen should come after i turn on my computer, for example if i shut down my computer for 5 hours when then i turn it on i face a Blue screen probably after 45Minutes-1-2-3 Hours every time i get a different error. First my computer was a 64MB Internal SiS Mirage graphics card and i rarely faced bluee screens, one blue screen may come every 2 weeks. But now i changed my card to nVIDIA N8400GS and i got nviddmkm.sys Error Blue screen every time i turn on the computer, i decided to change it and changed it to ATI RADEON HD 4350 512MB After that first i got a blue screen showing USBPORT.sys they told me it's a USB driver issue so i removed my USB Keyboard and put a PS-2 Keyboard, i downloaded the latest ATI HD 4350 Display drivers and installed it, and while am running an online game it's called "Conquer Online" and running Windows Media Player 11 not doing anything else then after about 40 minutes i got a blue screen:

A problem has been detected and windows has been shut down to prevent damage to your computer.

Watchdog.sys

PAGE_FAULT_IN_NONPAGED-AREA

if this is the first time you've seen this stop error screen, restart your computer, if this screen appears again, follow these steps:

Check to make sure any new hardware or software is properly installed. if this is a new installation ask your hardware software manufacturer for any windows updates you might need.

If problems continue, disable or remove any newly installed hardware or software. Disable BIOS memory options such as caching or shadowing.

If you need to use Safe Mode to remove or disable components, restart your computer, press F8 to select Advanced Startup options, and then select Safe Mode.